[yucca]

Hi Dave

There was 240 volts across the live and neutral connections coming into the oven. Unfortunately I didn’t do a continuity test to check whether there was a break in the neutral line. So many of the cables were the same damn colours! Unfortunately, I’m not at the oven today so can go and check now.

Regarding the rotary function control switch, is the intention to connect the brass terminals 1 to P1, 2 to P2 etc when rotated? I could see that some of the brass terminals were joined together e.g. 1,2,3 might have been connected simultaneously.

[yucca]

Thanks for replying.

Is there a way for me to be able to confirm that that is the problem?

The problem we have is that we can turn up the thermostat and we find that the bottom of the food cooks – in fact we find it actually burns but the top and the middle of the food just doesn’t get as hot as we would expect. Lots of heat seems to be ejected from the grills to the rear of the burners almost bypassing the food.

I’ve borrowed a thermometer and will try to see what temperature I’m getting. I’m almost minded to think that there seems to be an opening at the back/top of the oven letting all the heat escape. It’s like the heat is not being circulated properly. Also, is there likely to be a thermometer in the oven cavity itself? We find that the burner flames do reduce as the temperature increases so the gas valve must be working to some degree.

Thanks

[yucca]

Hey that’s a pretty good work around. Just have a timer switching it on and off. Not sure whether cutting and re-establishing power would cause further issues.

Unfortunately these things are now built so that they can’t be repaired easily and hence have to be thrown away. It’s such a waste.

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Ok, thanks.

In addition, my father-in-law has come across another machine of the same type and has taken resistance readings for the pins:

*) Pins 1&2: His:1.3 ohm, Mine:1.2 ohm
*) Pins 3&4: His:3.1 ohm, Mine:infinite
*) Pins 5&6: His:15 ohm, Mine:15.5 ohm

So that that’s conclusive. I was going to measure the voltage at the connector with the machine switched on during a spin cycle however my multimeter’s prongs were too large to fit into the slots and I didn’t want to damage the plastic plug by forcing them in.

One final thing, I tipped the machine on it’s left-hand-side to access the motor. I may be mistaken, but to me now, the drum seems to sit slightly higher than before.
It could be that normally there are clothes in the machine weighing it down. Does it sound like I’ve cream-crackered the suspension system (two springs on top and 2 support struts at the bottom)? Or am I just imagining this?

Thanks

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Thanks for the tip.

I’m happy to spend the cash If the motor is faulty. Like everybody else out there, I don’t want to throw good money after bad since a new machine is so much cheaper than the sum of its parts.

So, is there any other final test I can make to confirm that it is the motor and not anything else?

I’ve managed to take the motor off this time, so I could set the machine going and check the voltages at the 6 pins on the plug which connects to the motor. The trouble is I don’t know what to expect.

I know two pins will be for the brushes. And some pins will be for the field windings to generate the magnetic field … But what about the speed controller?

Does anyone know which is which? And what voltages I should be getting at each pin? I guess direction is controlled by another component higher up in the chain because I recall hearing clicks (relays?) whenever the direction of rotation changed.

Any insight would be gratefully appreciated!

Thanks

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Drat.

Should I have continuity between pins 3 & 4? And theres nothing else it could be?
Does that mean that my only option is a new motor? That’s a sizeable contribution to a new machine …

Is there anywhere I can get a reconditioned motor for less?

Thanks

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Hiya

There are 6 terminals on the motor and I have checked continuity between adjacent pairs of pins. So if the pins are numbered 1 to 6 sequentially, then I found the following:

Pins 1 & 2: continuity ok
Pins 3 & 4: no continuity
Pins 5 & 6: continuity ok

Does this mean I have a burnt out motor :eeek: or that the internal thermal fuse has blown :D?

The parts diagram (http://www.bosch-home.co.uk/store/spareparts/Washerdryer/WVT1260GB/01#explodeTab3) doesn’t show the fuse as a spare part …

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Ok, I’ll do that now. I’ll also check that the brushes are in contact with the commutator (I didn’t have one of the “commutator cleaning sticks” – can I improvise?)

The motor terminal has (I think) 6 pins and presumably, I’ll check continuity between pairs of adjacent pins?

If there is open circuit between some of the pairs, does that mean that the windings have burnt out?

[State of old brushes: The old brushes had worn down to say between 6mm and 10mm – through the base of one I could just about make out the copper braiding. One brush was slightly longer than the other.]

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Hi everybody,

Not good news I’m afraid.

I replaced the brushes with genuine Bosch ones and the drum still does not rotate.

Any way of me testing whether the motor is at fault versus the speed controller/board etc? I want to avoid systematically replacing one part after another (very costly seeing that the next part along the chain is the motor priced at £165!)

There’s going to come a point where I decide to throw in the towel and I’d rather cut my losses early ….

Thanks

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Hiya

I was going to err on the side of caution and you’ve convinced me.

I’ll get them ordered tomorrow.

Thanks for everybodys help.

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Spanish?

Marketing – that’s what it’s all about. We bought the machine for two reasons:

1) size – it had to go into a small space
2) make – Bosch as a brand has a good reputation (well at least I thought it did)

I guess you only know how good things are when they break down and you need to fix them.

You say the genuine brushes are a better quality – what sets them apart from the after-market products? When looking through the forums I have heard reference to “laminated” brushes being better (no idea why) as well as some after-market brushes causing overheating.

I don’t mind paying for the genuine article – if it will offer a genuine benefit.

Thanks

[yucca]

Re: Bosch WVT1260GB Drum Not Rotating

Hi there

I had a look at the brushes and sure enough the first one was worn down to about half a centimetre in length!!! (i didn’t bother looking at the second on the basis the first was so worn). I could even see the copper braiding through the bottom side of the brush which is in contact with the motor!!! Plenty of carbon dust everywhere and I’ve still got it on my hand even though I have washed them a number of times.

Should I replace them with a genuine Bosch part (http://www.bosch-home.co.uk/store/produ … ush/154740) which by the time I add postage is probably £40 or go for what appear to be far cheaper options from the likes of eBay etc? is there a difference? Would using an OEM part cause me problems in the long run?
I do happen to have a motor from another washing machine which my father in law gave me when we used to own a Zanussi. Is there any reason why I could not use the brushes from that motor in the Bosch if they fit?

As an aside, I could not get the motor off because it was held in by 2 very long bolts. The first I could remove easily, they second I could not because handily just behind the ‘head’ of the bold there’s the rubber gasket which connects the drum to the pump leaving very little clearance to remove the bolt. Talk about poor design. I’ve found a number of things with the design of this machine which have just made me think “why-oh-why-have-they-done-that”. I thought German engineering was meant to be good.

Thanks

[yucca]

Re: Bosch WVT1260GB dry clothes getting wet again

Yep, sorry, you did. Mea culpa.

I’ll have a thorough look at the condenser, fluff filter, washing machine trap over the weekend.

Thanks for your help.

[yucca]

Re: Bosch WVT1260GB dry clothes getting wet again

Ok. So its not a clever pressure relief valve.

But is it normal to get water dispensed back into the soap drawer?

Thanks

[yucca]

Re: Bosch WVT1260GB dry clothes getting wet again

Hi,

Yes, I cleaned the condenser in December – I’d look now except it’s late and it’s a right pain pulling the machine out, so I’ll save that for the weekend.

On the subject of “being designed that way” – are you referring to the feedback of water into the drum via the soap dispenser if there is too much back pressure on the outlet pipe?

If you are, then that makes me think there must be some blockage at the washing machine trap causing the back pressure. Presumably, under normal circumstances, water should not be dispensed back into the soap dispenser under a drying cycle (can’t think why there would be)?

Thanks

[Author]

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